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Question

Technetium (9843Tc) has a half - life of 4.2×106 yr. Strontium has a half - life of 28.79 yr. which of the following is correct?

A
Decay constant of Sr is greater than decay constant of Tc
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B
Activity of 100 g of Sr is less than activity of 100 g of Tc
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C
The long half - life of Tc shows that it decays by α - decay
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D
A Tc atom has a higher probability of decaying in 1 yr than a Sr atom
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